Genetics, Heredity, Variation, and Molecular Biology
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Free Biology Q & A Practice 1 of 5 free exam-style exercises in this topic
The pedigree below shows the inheritance of haemophilia A, an X-linked recessive condition, in a family. II-4 is unaffected.

I II III I-1 I-2 II-1 II-3 II-2 II-4 III-1 III-2 unaffected male affected male unaffected female


III-2 plans to marry an unaffected man. What is the probability that their first child will be a son with haemophilia?
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